There are exactly 3 ways to add 4 odd numbers to get 10. Find all
the ways of adding 8 odd numbers to get 20. To be sure of getting
all the solutions you will need to be systematic. What about a
total of 15 with 6 odd numbers?

Brailler

Stage: 3 Challenge Level:

In the first part of the question, you can start by narrowing
down the broken pin to one of only two possibilities.

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